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Adler, David A.

Simple Machines: Wheels, Levers, and Pulleys

32 pp. | Holiday | May, 2015 | Trade ISBN 978-0-8234-3309-4 $17.95
(3) K-3 Illustrated by Anna Raff. "A gear is a wheel with teeth. Gears can change the speed, power, and direction of a machine's work." With the help of a seen-but-not-heard cat and a collection of children, this book gives accessible examples of the simple machines of the title, such as seesaws, faucets, and construction cranes. Pastel illustrations are lively and friendly, with just enough detail.
Reviewer: Frieda F. Bostian

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